Catalytic effects of FGO-Ni addition on the dehydrogenation properties of LiAlH4

• Published in: International journal of hydrogen energy Vol. 47; no. 62; pp. 26458 - 26467
• Main Authors: Feng, Wang, Xue ping, Zheng, Xue qin, Ma, Yue hui, Dang, Xiao yan, Zhang, Zi wei, Xia
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 22.07.2022
• Subjects: FGO; Hydrogen release properties; LiAlH4; LiAlH4; Ni; Hydrogen release properties; FGO
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2022.03.028

LiAlH4 is an ideal hydrogen storage material with a theoretical hydrogen storage capacity of 10.6 wt%. In order to reduce the hydrogen release temperature and increase the hydrogen release amount of LiAlH4, multilayer graphene oxide and nickel (FGO-Ni) composite catalyst were prepared by physical ball milling and doped into LiAlH4. The effect of FGO-Ni composite catalyst on the dehydrogenation performance of LiAlH4 was studied by pressure-composition-temperature apparatus, scanning electron microscope (SEM) and X-ray diffractometer. The results show that, compared with pure LiAlH4, the hydrogen release time of LiAlH4 doped with 9 wt%FGO-3wt%Ni is obviously shortened about 90min at 150 °C and the hydrogen release amount of LiAlH4 doped with 9 wt%FGO-3wt%Ni also increased 1.8 wt%. Importantly, the dehydrogenation amount of LiAlH4 (9 wt%FGO)-3wt% could reach 4 wt% at 135 °C which was 4 times higher than that of the pure LiAlH4. At the same temperature, the hydrogen release of pure LiAlH4 was only 0.84 wt%. In contrast, doping FGO-Ni composite catalyst reduces the hydrogen release temperature of LiAlH4 and weakens the hydrogen release barrier. Forthermore, SEM results showed that doping FGO-Ni reduced the agglomeration between LiAlH4 particles and increased the specific surface area of the sample, which improving the hydrogen release properties of LiAlH4. [Display omitted] •The preparation of the composite catalyst FGO-Ni requires only simple physical grinding.•The FGO-Ni catalyst reduces agglomeration between LiAlH4 particles.•The catalyst FGO-Ni can improve the low temperature hydrogen release performance of LiAlH4.•The catalyst FGO-Ni can shorten the hydrogen release time of LiAlH4.